Example: Breckenridge, CO is located at approximately 2,900m altitude. For a 1000 kVA transformer, the derated value would be: 𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫 𝒌𝒌𝒌𝒌𝒌𝒌 = 𝟏𝟏 𝟏𝟏 𝟏𝟏𝟏𝟏 𝒌𝒌𝒌𝒌𝒌𝒌 𝒙𝒙 𝟏𝟏𝟏𝟏𝟏𝟏 − ඌ𝟐𝟐𝟐𝟐𝟐𝟐𝟐𝟐 − 𝟏𝟏 , 𝟎𝟎 𝟎𝟎 𝟎𝟎 𝟏𝟏 𝟏𝟏 𝟏𝟏 𝒙𝒙 𝟎𝟎 . 𝟓𝟓 % ඐ ൨ 𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫 𝒌𝒌𝒌𝒌𝒌𝒌 = 𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏 𝒌𝒌𝒌𝒌𝒌𝒌 𝒙𝒙 [ 𝟏𝟏𝟏𝟏𝟏𝟏 − ⌊𝟏𝟏𝟏𝟏 𝒙𝒙 𝟎𝟎 . 𝟓𝟓 % ⌋ ] 𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫 𝒌𝒌𝒌𝒌𝒌𝒌 = 𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏 𝒌𝒌𝒌𝒌𝒌𝒌 𝒙𝒙 [ 𝟏𝟏𝟏𝟏𝟏𝟏 − ⌊𝟗𝟗 . 𝟓𝟓 % ⌋ ] 𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫 𝒌𝒌𝒌𝒌𝒌𝒌 = 𝟏𝟏𝟏𝟏𝟏𝟏𝟏𝟏 𝒌𝒌𝒌𝒌𝒌𝒌 𝒙𝒙 [ 𝟗𝟗𝟗𝟗 . 𝟓𝟓 %] 𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫 𝑲𝑲𝑲𝑲𝑲𝑲 = 𝟗𝟗𝟗𝟗𝟗𝟗 𝒌𝒌𝒌𝒌𝒌𝒌
Page 37
Made with FlippingBook - PDF hosting